Thanks, I do my best .Like the part on the bottom of the PCB away from the heat of the tubes . Very well done unit.
Thank you kissabout 2002, I have same opinion .
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Is the power switch a normal push button or does it control a latching circuit?
I use one of these: 12V 500mA AC-DC Power Supply Converter Step Down Electronic Transformer *** | eBay
to power one of these: Relay Module 1 Channel 12V Latching With Touch Bistable Switch MCU Control Tool | eBay
interesting approach, I guess the goal is to avoid long-running power cables to the front-panel ?
What is the idle consumption of these two modules when amp is off ?
Looks beautiful, Wavebourn. So, 6W seems like a massive amount of power for headphones. My 32 ohm Beyerdynamic DT-880s are rated for 0.1W power handling, for instance. Does this mean it's OK to put that much power into a set of headphones, as long as the signal is attenuated enough that hearing isn't damaged? Would you mind saying more about how you designed this?
I'm curious because I'm currently designing an amp for 7C5 (loctal 6V6GT) that has OPTs with 8 ohm and 32 ohm secondaries, and am starting to think through proper attenuation for the headphone output.
From my humble budget and hands to the basement of good sounds...
13EM7 spud mono blocks using ideas from many and all the best parts I had laying around
In the background are Frugel Horn XLs...the Preamp is an Aikido, the DCP is vintage Magnavox
Not many things I see online make me smile. This one did.
Not sure about the SMPS, but when I use a 3VA transformer, it draws 1.5W. The SMPS is rated for 6W out, so with no load it should be under 1W from the wall.
And it was more about having soft power and the "cool" factor than anything... but it does avoid 60Hz power running through the amp.
EDIT: Just found a cheaper latch: 1 Channel Latching Relay Module with Touch Bistable Switch NiceSETC | eBay
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With 3 nested feedback loops 5881 sound surprisingly well.
EL34, though, sound slightly better. There is a screen grid voltage adjustment pot under the hood, with small red digital gauges to show voltage drop on cathode resistors, you see slight red glow under output tubes, to adjust the amp for particular pin-compatible tubes.
Wavebourn - Adjustable auto-bias | Facebook
Versions with VT-127, 4Р10С, 6CD6 and 6CB5A tubes are also available.
I use latching switches rated for 250V.
https://www.amazon.com/gp/product/B019WRH3OC/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1
This power is needed for planar magnetic headphones. For headphones like yours the amp has attenuators and the left TRS socket. The right TRS and 4-pin XLR are for headphones that need power.
The Best Planar Magnetic Headphones - Top 10 — Audiophile On
Even though planar magnetic headphones have different impedances and are rated for different power, I found that the voltage to drive them is approximately the same. 6W with 1% may be too much, but with a headroom there would be much less distortions than on 6W.
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Thanks, I do my best .
Thank you kissabout 2002, I have same opinion .
...and the tubes are on the edge, to open convection path. Good.
Finally finish, 6922 push-pull headphone amplifier, versatile design by B.Heran, can be used with most of dynamic headphones until 150 ohms with Edcor XSM10K/150 but for higher headphone impedance the Edcor XSM10K/600 can be used without any modification in the original design. I add to the original design a balance control and VU meter, I know this amp looks weird, I used mostly recycled material even water pipe elbow, but I am happy with it, but most of all sound incredibly well, dead silent, no distortion even at max volume and brilliant soundstage, 100 mV of signal input will result in about 50 milliwatts of output power. All the best to everybody...
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It has indeed a somewhat menacing look.
I do not think that my wife would allow me to place this amp in our living room
lol...so Joe do not do it, btw I haven't show it to my wife yet
Well as you certainly have guessed I was just kidding . But....... those uA meters, what are they measuring? Where did you purchase those? I am still looking for some mA meters which have a back light. At the moment I am redesigning my own headphone amp to make it more suitable for my 300 Ohm Sennheiser HD650 headphone.
. But....... those uA meters, what are they measuring? Where did you purchase those? I am still looking for some mA meters which have a back light. At the moment I am redesigning my own headphone amp to make it more suitable for my 300 Ohm Sennheiser HD650 headphone.The uA meters are connected to the secondary of the output transformer with a shottky diode and 10uf cap plus I had to add a switch for select low volume and high volume, takes me months to find them in the local market here in Philippines, because all shops have the 200 uA model but for a headphone amp the tiny signal will not even move it a full volume, then I find the 50 uA that goes well with this amp but they did not have back light so I add myself 5 led on the back for have the back light, but I think you can find very good ones on eBay...all the best
